/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#include "itkAtanRegularizedHeavisideStepFunction.h"
#include "itkTestingMacros.h"

int itkAtanRegularizedHeavisideStepFunctionTest1( int, char* [] )
{
  using InputType = double;
  using OutputType = double;

  using HeavisideFunctionBaseType = itk::AtanRegularizedHeavisideStepFunction< InputType, OutputType >;

  HeavisideFunctionBaseType::Pointer functionBase0 = HeavisideFunctionBaseType::New();

  std::cout << "GetNameOfClass() = " << functionBase0->GetNameOfClass() << std::endl;
  functionBase0->Print( std::cout );

  constexpr double epsilon0 = 1.0;
  const double epsilon1 = 1e-4;

  TEST_SET_GET_VALUE( epsilon0, functionBase0->GetEpsilon() );

  functionBase0->SetEpsilon( epsilon1 );
  TEST_SET_GET_VALUE( epsilon1, functionBase0->GetEpsilon() );

  constexpr double epsilon2 = 0.5;
  functionBase0->SetEpsilon( epsilon2 );

  const signed int minValue = -20;
  constexpr signed int maxValue  = 20;

  constexpr InputType incValue  = 0.1;

  for( signed int x = minValue; x < maxValue; x++ )
    {
    const InputType ix = x * incValue;
    OutputType f  = functionBase0->Evaluate( ix );
    OutputType df = functionBase0->EvaluateDerivative( ix );
    std::cout << ix << " " << f << " " << df << std::endl;
    }

  return EXIT_SUCCESS;
}
